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(No Model.)

1), SULLIVAN.

MAN HOLE AND HANDHOLE STOPPER. No. 247,225.

Patented Sept. 20, 1881.

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UNITED STATES PATENT OFFICEO DANIEL SULLIVAN, OF CENTRAL FALLS, RHODEISLAND.

MAN-HOLE AND HAND-HOLE STOPPER.

SPECIFICATION forming part of Letters Patent No. 247,225, datedSeptember 20, 1881.

Application filed January 26, 1881. (No model.) I

To all whom it may concern Central Falls, in the county of Providenceand State of Rhode Island, have invented certain new and usefulImprovements in Man-Hole and Hand-Hole Stoppers; and I do hereby declarethat the following is a full, clear, and exact description of theinvention, that will enable others skilled in the art to which itappertains to make and use the same, reference being had to theaccompanying drawings, forming a part of this specification, in which-Figure 1 shows a section of my invention; Fig. 2, plan of plate A; Fig.3, perspective of stopper.

Same letters show like parts.

My invention consists ofa man-hole or handhole stopper for steamboilers, generators, &c., so arranged as to be readily removed andreplaced, while at the same time securely closing the opening when inposition.

My invention will be understood by reference to the accompanyingdrawings.

A shows a plate securely bolted to the boiler, and provided with theopening I), circular in form, with the exception of the smallsemicircular sections 0 c removed from its opposite edges.

At (1 is a circular stopper of the size of the opening I), provided withthe screw-bolt e, and having around its lower edge an elliptical flange,f, the width of which at its narrowest diameter being slightly less thanthe width between the semicircles c 0, thus allowing it to pass throughthe opening I).

At 9 g are semicircular projections fitting the openings 0 c.

When the stopper is to be inserted a rubber packing is placed around theflange f and the stopper passed through the opening an d turnedone-fourth way round, so that the projections g 9 enter the openings '00, filling them. The

l cup or yoke his then put on the screw-bolt Be it known that I, DANIELSULLIVA of projecting through it, and the nut iscrewed in place,tightening the whole.

It will be observed that the entire opening is filled by metal, and thenany necessary power may be applied to a refractory bolt without dangerof turning the stopper. All the surfaces to be packed are circular inform, and hence may be turned to a groundjoint, which cannot be donewhen the shape of the stopper is oblong.

In some cases the plate A may be dispensed with, the stopper beingapplied directly to the boiler, which, in such case, is the equivalentof the plate, or the plate may be placed on the top of or form part of adome, the end of a cylinder, or the like; but I do not regard thesevariations as affecting my invention; nor do I limit myself to the formof the openings 0 c or projections g g, provided they correspond witheach other.

I am aware thatman and hand hole apertures circular in form have beenused before, and that various devices have been employed for filling orclosing them with metal plugs or stoppers. I do not therefore claim,broadly, these features; but

What I claim, and desire to secure by Letters Patent, is

In combination with a plate, A, provided with the openings b c c, thestopper (1, and flange f, having projections g g thereon correspondin gto the openings 0 0, together with the screwbolt, nut, and cup or yoke,as common, substantially as herein set forth.

In testimony that I claim the foregoing I have hereunto set myhand this11th day of January, 1881.

DANIEL SULLIVAN.

Witnesses:

DANL. P. MCGILLICUDDY, J osEPI-I F. HARRIGAN.

